<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="lib/vue.js"></script>
    <style>
        [v-cloak]{
            display: none;
        }
    </style>
</head>
<body>
    <div id="root" v-cloak>
        <p>{{str}}</p>
        <p v-pre>{{str}}</p>
        <input v-model="str" type="text">
        <p v-once>{{str}}</p>
    </div>
</body>
<script>
    // setTimeout(()=>{
        new Vue({
            el: '#root',
            data : {
                str : 'sxx'
            }
        })
    // },1000)

</script>
</html>